MarsSeed [1] filed a deletion request for libunity [2]: No longer needed. EOL since 2019. All of its mandatory reverse dependencies are obsolete/EOL, some are broken. And all of them are submitted for deletion.
There is not any Unity Desktop Environment / Unity Shell packages in Arch or AUR repos anymore. The last ones were deleted during the past 1-2 years due to being unmaintained and broken. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/libunity/
